Amazon Basics 4-Pack Rechargeable C Cell NiMH Batteries, 5000 mAh, Pre-Charged, Low Self Discharge, Recharge up to 1000x Times

Knowing what I know now, batteries are always going to be hit or miss. I can use multiple sets of Duracell batteries and one set will last twice as long as the other set. Now, with the set that I received here, I use it on a trash can sensor, they've lasted more than 2 weeks so far so I'm happy about that. One thing you need to make sure of is, don't use the batteries until it's out of juice. If you do that too much, it'll stop recharging, the way to fix this is you'll need to touch a good battery with a bad battery on the + ends of the battery, then have a metal wire touching both -(minus) ends for 30 seconds which will give it a bit of charge so the charger recognizes the battery.

I bought a 4-pack of AmazonBasics NiMH Low Self-Discharge C Cells in 2019 Oct for standby service: they'll allow extended use of my 2 C cell flashlight in case of prolonged power failure or other need. Note that when I purchased, the product page did not make any mention of low self-discharge; I inferred and hoped that would be the case, and it has proven so. The product page was later updated to mention low self-discharge. The cells I received had been manufactured in 2019 Jul. Note the manufacturing date was (lightly) stamped into, not printed onto, the labels. Favorable lighting angle and a bit of scrutiny (OK, I "cheated" and used a magnifying glass...) can be required for reading. I used an AccuPower IQ-338XL battery analyzer to test the cells on receipt and again after about 16.5 weeks of storage. The results have been excellent, implying these will serve my purpose well. The comparatively low price is a nice bonus. On receipt, the cells delivered an average of 3.6 A*h, about 73% of their rated 5 A*h capacity. Maximum cell-to-cell variation was 4.5%. Freshly charged, the cells delivered an average of 5.2 A*h, or nearly 104% of rated capacity. Maximum cell-to-cell variation was 4.8%. After about 16.5 weeks storage, the cells delivered an average of 4.6 A*h, about 92% of rated capacity. So yes, they are indeed low self-discharge (LSD) and exhibiting very good initial charge retention. Note that LSD NiMH cells typically exhibit higher self-discharge in the initial weeks after charging before settling to their longer-term much slower self-discharge rates. These cells did a nice (excellent?) job of initial charge retention. Oh, and maximum cell-to-cell capacity variation was 4.7%. Nice. The cells accepted in the range of 103% to 111% of rated capacity when charged from "empty" (had been discharged to about 0.9 V/cell), and my IQ-338XL had no difficulty properly terminating charge of any of these cells. The small differences between accepted and delivered capacities show good efficiencies at the modest currents (500 mA discharge, 1.5 A charge) applied via the IQ-338XL. So, my testing has shown these are just what I wanted and they're working well.

They work great, I didn’t realize that I needed a charger for this, the good thing it that they came fully charged, and we were able to use them. I purchased for a Christmas train, and we were able to used them right away!

Intro: Item: "Amazon Basics 4-Pack Rechargeable C Cell NiMH Batteries, 5000 mAh, Recharge up to 1000x". I purchased (Amazon) and charged these Amazon C batteries with "XTAR VC4SL Battery Charger and Included QC3.0 Adapter" I had problems charging these batteries when they arrived, therefore I am including my charging problems and remedies, below. Obviously, other chargers may act differently. After reading the reviews for both the batteries and the charger, I realized that the charging process takes some hours, and that 4 batteries would probably take around 24+ hours, therefore I charged my Amazon C batteries, 2 at a time. Since I had 8 batteries, I was able to make sure that all charger slots would work by charging the pairs in different slots. Con: There are too many charging modes and choices to understand without spending a lot of time studying, only to forget within a few weeks before the next recharging. (The instructions on line and also printed, are abysmal). After I simply inserted for charging my 8 Amazon "5,000mAh" C batteries, (in pairs), I was ready to yell because they only reached roughly 1,400mAH Pro: HOWEVER, the charger's 800# support phone is GREAT! Support was patient and good in all respects. Eventually, I was told to click the little retangular rubber "mode" button until "CHG" showed up on the screen, and then charged my batteries (a slow but automatic full process of charge, discharge, charge). This was successful and all of my 8 Amazon "5,000mAh" C batteries reached roughly "5,000mAh".

Working perfect , been 6 months in my auto cat feeder

Very good batteries

So far so good with these batteries, they’ve gone through 2 full charges with no problem. The take a couple hours to charge and last in my dogs toy treat feeder for a week or so.

0 stars should be an option. DO NOT PURCHASE even if the price point is good. These batteries are absolute trash. They do not hold a charge and my charger routinely identifies more and more as bad although I have a high quality charger (Nitecore which I highly recommend). I wish I could return the 20 that I currently own and have only charged maybe five times, but unfortunately it's too late. The value for money is zero, the quality control is zero, the rating is zero.

Bought this roughly 6-8 months ago for an automatic garbage can (yes you read that right) and somehow the batteries are still going off the same charge I received them in... very impressive

Good battery

Fully charged out of the box. Appear to be well designed and built. A slightly tighter fit than the C cells that I was replacing but not a problem. Overall a good product at a budget price.

These ones work well and great quality compared to there more expensive opposition.

Piles de qualité. Tiennent bien la charge.